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We have a Vitotronic 200 model KW2 controller on our Viessmann oil boiler, installed by prior owner in 2003. It runs a Crown DHW tank. The other day, we had no hot water. The DHW temperature was reading 262 F. Obviously, bad DHW sensor. No issues with any of it up to this point.
Tech came out and installed a new DHW sensor and left. No adjustments were made. Now, the water isn't nearly as hot as it used to be. I had the DHW temp set to around 120 before any of this happened. Now, even if I crank it up to 135, it's noticeably cooler coming out of the shower.
Is there something that I can adjust, or do I need another new sensor?